package com.mszlu.blog.service;

import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.mszlu.blog.dao.mapper.ArticleMapper;
import com.mszlu.blog.dao.pojo.Article;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

@Component//
public class ThreadService {
    @Async("taskExecutor")

            //期望此操作在线程池执行，不会影响原有的主线程
    public void updateArticleViewCount(ArticleMapper articleMapper, Article article) {

        int viewCounts = article.getViewCounts();

        Article articleUpdate = new Article();
        articleUpdate.setViewCounts(viewCounts+1);
        LambdaUpdateWrapper<Article> updateWrapper = new LambdaUpdateWrapper<>();
        updateWrapper.eq(Article::getId,article.getId());
        //设置一个为了在多线程的环境下  线程安全  做个下列操作
        updateWrapper.eq(Article::getViewCounts,viewCounts);

        //update  article set view_count = 100 where view_count=99 and id=11
        articleMapper.update(articleUpdate,updateWrapper);

        try {
            //睡眠5秒
            Thread.sleep(5000);
            System.out.println("更新完成了");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }
}
